@Confucius
You're an idiot for assuming that Sasuke's a coward; he just went a different way in handling the Bijuu. Catching people off guard is actually a ninja trait! What is Sasuke suppose to do? Say "hey guys im going to control the Bijuu! Get ready!"
@Troyg39
I don't understand what's the issue. What Sasuke has is the Rinnegan, which is clearly a more powerful version of the original Rinnegan. By obtaining the Rikudo's power, Sasuke perhaps gained the additional tomoe's to make it a slight different version from the original Rinnegan. Still you can't just say that Sasuke needed the Juubi's eye to pull that off. Madara or Nagato, for that matter, didn't need a higher version of Rinnegan to use Chibaku Tensei. When you achieve higher power such as Madara by wielding both Rinnegan, then your power with the dojutsu increases, especially in his final form that had the three eyes. We saw how powerful Madara was when he used Chibaku Tensei -- least Sasuke isn't the Juubi-Jin! Sasuke is using his full potential as Indra's reincarnation, just exactly as Naruto, who will show us his full potential soon.